Search Publications
Study of the Inner Structure of the Molecular Torus in IRAS 08572+3915 NW with Velocity Decomposition of CO Rovibrational Absorption Lines
Onishi, Shusuke; Nakagawa, Takao; Baba, Shunsuke +6 more
Understanding the inner structure of the clumpy molecular torus surrounding the active galactic nucleus is essential in revealing the forming mechanism. However, spatially resolving the torus is difficult because of its size of a few parsecs. Thus, to probe the clump conditions in the torus, we performed the velocity decomposition of the CO rovibr…
Interferometric Imaging of λ Andromedae: Evidence of Starspots and Rotation
White, R. J.; Baron, F.; Parks, J. R. +14 more
Presented are the first interferometric images of cool starspots on the chromospherically active giant λ Andromedae. Using the Michigan Infra-Red Combiner coupled to the Center for High Angular Resolution Astronomy Array, 26 interferometric observations were made between 2008 August 17 and 2011 September 24. The photometric time series acquired at…
On the Nature of Propagating Intensity Disturbances in Polar Plumes during the 2017 Total Solar Eclipse
Madjarska, Maria S.; Lim, Eun-Kyung; Yang, Heesu +8 more
The propagating intensity disturbances (PIDs) in plumes are still poorly understood, and their identity (magnetoacoustic waves or flows) remains an open question. We investigate PIDs in five plumes located in the northern polar coronal hole observed during the 2017 total solar eclipse. Three plumes are associated with coronal bright points, jets, …
Discovery of a Wind-blown Bubble Associated with the Supernova Remnant G346.6-0.2: A Hint for the Origin of Recombining Plasma
Filipović, M. D.; Suzuki, H.; Fukui, Y. +3 more
We report on CO and H I studies of the mixed-morphology supernova remnant (SNR) G346.6-0.2. We find a wind-blown bubble along the radio continuum shell with an expansion velocity of ~10 km s-1, which was likely formed by strong stellar winds from the high-mass progenitor of the SNR. The radial velocities of the CO/H I bubbles at V …
Born in a Pair (?): Pisces II and Pegasus III
Garofalo, Alessia; Calura, Francesco; Paris, Diego +5 more
We have used B, V time-series photometry collected with the Large Binocular Telescope to undertake the first study of variable stars in the Milky Way ultra-faint dwarf (UFD) satellites Pisces II and Pegasus III. In Pisces II we have identified an RRab star, one confirmed and a candidate SX Phoenicis star, and a variable with uncertain classificati…
EvryFlare. IV. Detection of Periodicity in Flare Occurrence from Cool Stars with TESS
Law, Nicholas M.; Howard, Ward S.
Phased flaring, or the periodic occurrence of stellar flares, may probe electromagnetic star-planet interaction (SPI), binary interaction, or magnetic conditions in spots. For the first time, we explore flare periodograms for a large sample of flare stars to identify periodicity due to magnetic interactions with orbiting companions, magnetic reser…
White Dwarf Photospheric Abundances in Cataclysmic Variables. I. SS Aurigae and TU Mensae
Sion, Edward M.; Godon, Patrick
Chemical abundance studies of cataclysmic variables have revealed high nitrogen to carbon ratios in a number of cataclysmic variable white dwarfs (based on ultraviolet emission and absorption lines), as well as possible carbon deficiency in many secondaries (based on the absence of infrared CO absorption lines). These indicate that the accreted ma…
A Multi-instrument Study of the 2018 Hard-state-only Outburst of H1743-322
Stiele, H.; Kong, A. K. H.
Distinct changes of the spectral and variability properties observed in black hole transients during a bright outburst deliver insight into the evolution of the accretion flow and accretion geometry. We investigated NICER and Swift monitoring observations of H 1743-322 during its 2018 outburst as well as NuSTAR and XMM-Newton data. The observed ha…
The Encounter of the Parker Solar Probe and a Comet-like Object Near the Sun: Model Predictions and Measurements
Zong, Qiugang; He, Jiansen; Ip, Wing-Huen +15 more
The Parker Solar Probe (PSP) aims to explore the nascent solar wind close to the Sun. Meanwhile, PSP is also expected to encounter small objects like comets and asteroids. In this work, we survey the ephemerides to find the chance of a recent encounter and then model the interaction between released dusty plasmas and solar wind plasmas. On 2019 Se…
ALMA Observation of the Protoplanetary Disk around WW Cha: Faint Double-peaked Ring and Asymmetric Structure
Dong, Ruobing; Kataoka, Akimasa; Takami, Michihiro +13 more
We present Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 observations of dust continuum emission of the disk around WW Cha. The dust continuum image shows a smooth disk structure with a faint (low-contrast) dust ring, extending from ∼40 au to ∼70 au, not accompanied by any gap. We constructed the simple model to fit the visibility of …